[Solved] Identify the error in this code snippet:class Group: def __init__(self): self.users = set() def add_user(self, user): self.users.append(user) | LLD

LLD - Design — Splitwise (Expense Sharing)

Identify the error in this code snippet:

class Group:
    def __init__(self):
        self.users = set()
    def add_user(self, user):
        self.users.append(user)

AUsing set instead of list for users

BUsing append method on a set

CMissing return statement in add_user

DIncorrect constructor name

Step-by-Step Solution

Solution:

Step 1: Check data structure methods
Set objects do not have append method; they use add() instead.
Step 2: Identify method misuse
Calling append on a set causes an error.
Final Answer:
Using append method on a set -> Option B
Quick Check:
Set uses add(), not append [OK]

Quick Trick: Sets use add(), lists use append() [OK]

Common Mistakes:

MISTAKES

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